For anyone who is thinking about doing this and having trouble locating parts, here is what I've come up with: (Most of the previous directional posts about this are outdated - websites don't exist any longer amongst other things. )
Summit Racing is a great place to find bulkhead fittings. There are others, but I was able to navigate and figure out best.
Starting at the Fuel Tank to the Aux Tank
VPE-11384 : -6AN to 1/4"NPT Female Swivel 90 Degree Adapter Fitting
EDD-844440 : Fitting, Brass, Straight, 1/4 in. Hose Barb, to 1/4 in NPT Male Threads
1/4" hose to a quick connect. (I had this previously, but there are some available at Summit as well)
1/4" hose to fuel filter (I'm using an inline K&N)
1/4" hose to on/off petcock to tank
I also purchased AEI-15644, which is a Fuel Cell Bulkhead Fitting. It contains 2 teflon washers and a nut. Others have mentioned on this forum this is what they've used. Ironically, it was cheaper to purchase this instead of the nut and 2 washers individually. Also, I can use this IF my other "brilliant" idea doesn't work out...
I went with the -6an instead of the 1/4" npt as the npt has tapered threads. Some websites say it's nearly impossible to use 2 nuts to tighten against the tank due to the taper, but some have done it.
Great website on the difference between AN and NPT:
I will update in a few days as this project continues... I'm having a local shop do the drilling as I am not 100% confident in my abilities. If anyone has any suggestions, I'm open! Thanks